ProPhotoRGB to sRGB? Colo(u)r Issues

Hi All
I am using Windows VistaHome Premium 32bit with an Intel QuadQ6600 @2.4GHz and 3Gb Ram (Not great I know!)
I use LR2.6 and PSCS4...and a Spyder3 Elite to calibrate my monitor and calibrate on a weekly basis.
I import images into LR, process them whilst working in the ProPhoto color space and then use 'Edit in Photoshop' to transfer the image into PS for further work...
When the image moves from LR to PS it renders identically and there are no issues with color at all.
After I have processed in PS I go to Edit/Convert to Profile and convert to sRGB (IEC61966-2.1) in order to upload images to the web...
All looks well until I go to File/Save for Web & Devices which defaults to the Preview - Monitor Color and I get huge color disparity which is apparent across all pics regardless of subject/lighting or initial saturation. If I switch the Preview to Windows (No Color Management) then I get the image as it should be..????
I am convinced that I have something set incorrectly but for the life of me can't find the offending item...It was suggested on another posting that I should try resetting PS by holding down Shift/Ctrl/Alt when I start PS which I have done but this makes no difference.
If I can supply any further information or if my ignorance is obviously solved I would be extremely grateful for any help...!!!
Many, many thanks!

Hi J Maloney
Thanks for the response...
However, in going to 'Edit/Convert to Profile...' am I not already embedding the sRGB profile...?
I don't understand why after saving the image via 'Save for Web and Devices..' and I view it in Windows Photo Gallery then the color renders correctly?
But if I upload to the web then the color is more saturated than the original file??? (and blues especially are changed)
I have attached an example of what I mean..
Attached is an image again containing three versions of an image...
On the right is the version as it appears in LR/PS...ie as I want it to.
However, after converting to sRGB and trying to 'save for web and devices' if I leave the central window on 'Optimized' the image displays as per that on the right...ie correctly...
But if I flick the tab that says 'Original' as I have in this example it shows the image much bluer (and not a nice shade of blue either... )
And then if I click Preview in the 'Save for Web and Devices' I get the web version on the left which is the same as the 'Original' tab in the central window...
So the top and bottom is that the versions I think I am working with in LR/PS appear not to be the correct rendering...however, the situation is not remedied by simply turning off the screen calibration so there is obviously something else amiss somewhere???
Cheers

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    2) What color management settings do you have set on the printer?  Are they some sort of Automatic color or have you set a specific color profile to match the paper?
    3)  What happens if you have LR manage the color with a paper-specific profile set in LR and set the printer not to manage color?  Does the first page print differently, then?  Create smallish-sized prints on each page so as not to waste ink.  This is the way I'd have LR and the printer setup, with LR doing the color-management and the printer not.  You haven't said how you have your printer settings, so something that could be happening is LR is expecting the printer to do the color-management and the printer is expecting LR to be doing it, so its not working right.
    4)  A first page printing differently than the others can be a setting in the printer, to handle a cover-page differently than the rest, because it has different paper.  I have no experience with your printer, but you might look to see if there is such a setting.
    5)  You haven’t said if you’re using any LR printing layout preset or not.  If so then try printing without having selected one or select a completely different, standard one, and see if the problem clears up.
    6)  LR will remember the last printer and printer-driver settings that you used, so if the driver is updated but LR is remembering settings for the previous driver, then things can get messed up.  You can try uninstalling and reinstalling the printer drive.  You can try installing another copy of the printer driver using a different name for the printer, that way LR’s saved settings shouldn’t be associated with that new name.
    7)  As a last resort, and only after reviewing various preferences you have set in LR, you can try to reset LR’s preferences, in case something is corrupted and causing problems.  The way to reset the preferences is to exit LR and rename the preferences file to something without an .agprefs extension, then restart LR.  If renaming doesn’t seem to be working, then move the .agprefs file to your desktop, temporarily.  You can delete the preferences file, but it’s safer to rename it or move it, in case it doesn’t fix the problem, then you can rename or move it back and have all your old preferences back, instead of recreating all the non-default settings.  The Preferences file location along with many other things, is documented here:
    http://members.lightroomqueen.com/Knowledgebase/Article/View/1373/205/lightroom-5-default- locations
    Finally, is there a reason you’re using LR 5.0 rather than one of the newer versions, in case 5.0 has a bug that has been fixed in subsequent versions?
    Various LR versions can be follow by clicking on the Windows/Mac link under Lightroom down near the bottom of the center column of the Adobe Updates page: http://www.adobe.com/downloads/updates

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